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Overview

overview

10

Static

static

8f368b029a...8a.exe

windows7_x64

10

8f368b029a...8a.exe

windows10_x64

10

Analysis

  • max time kernel
    153s
  • max time network
    61s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    10/07/2021, 10:36

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General

  • Target

    8f368b029a3a5517cb133529274834585d087a2d3a5875d03ea38e5774019c8a.exe

  • Size

    144KB

  • MD5

    89895cf4c88f13e5797aab63dddf1078

  • SHA1

    1efc175983a17bd6c562fe7b054045d6dcb341e5

  • SHA256

    8f368b029a3a5517cb133529274834585d087a2d3a5875d03ea38e5774019c8a

  • SHA512

    d238fa264ad931ed43798a65f01cbe1d044300dbe5312bdcef8540f2757079514daae27f30f2369b7b811a3273c961f9fd38e7ae5010c11120c83906e8c102e2

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'UWUEbcQLr'; $torlink = 'http://rk2zzyh63g5avvii4irkhymha3irblchdfj7prk6zwy23f6kahidkpqd.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};
URLs

http://rk2zzyh63g5avvii4irkhymha3irblchdfj7prk6zwy23f6kahidkpqd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 6 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Enumerates connected drives 3 TTPs 22 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 52 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8f368b029a3a5517cb133529274834585d087a2d3a5875d03ea38e5774019c8a.exe
    "C:\Users\Admin\AppData\Local\Temp\8f368b029a3a5517cb133529274834585d087a2d3a5875d03ea38e5774019c8a.exe"
    1⤵
    • Loads dropped DLL
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1276
    • C:\Users\Admin\AppData\Local\Temp\1073r.exe
      "C:\Users\Admin\AppData\Local\Temp\1073r.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1468
    • C:\Users\Admin\AppData\Local\Temp\ATICfQfcDlan.exe
      "C:\Users\Admin\AppData\Local\Temp\ATICfQfcDlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:520
    • C:\Users\Admin\AppData\Local\Temp\OqdxPrOLTlan.exe
      "C:\Users\Admin\AppData\Local\Temp\OqdxPrOLTlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:928
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:1552
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:1632
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1808
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:1572
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:112
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:948
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:1032
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:1832
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:1884
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:1144

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/1276-60-0x0000000075B31000-0x0000000075B33000-memory.dmp

            Filesize

            8KB

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